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Moderate mag. 4.9 earthquake - South China Sea, 39 km northwest of Laoag, Province of Ilocos Norte, Philippines, on Friday, Mar 17, 2023 at 9:23 pm (GMT +8) -

Moderate mag. 4.9 earthquake - South China Sea, 39 km northwest of Laoag, Province of Ilocos Norte, Philippines, on Friday, Mar 17, 2023 at 9:23 pm (GMT +8) Moderate mag. 4.9 earthquake - South China Sea, 39 km northwest of Laoag, Province of Ilocos Norte, Philippines, on Friday, Mar 17, 2023 at 9:23 pm (GMT +8)

Moderate magnitude 4.9 earthquake at 26 km depth

17 Mar 13:33 UTC: First to report: GFZ after 10 minutes.
17 Mar 13:41: Magnitude recalculated from 4.5 to 5.0. Epicenter location corrected by 4.6 km (2.9 mi) towards NE.
17 Mar 13:43: Now using data updates from USGS

Earthquake details

Date & timeMar 17, 2023 13:23:29 UTC -
Local time at epicenterFriday, Mar 17, 2023 at 9:23 pm (GMT +8)
Depth26.3 km
Epicenter latitude / longitude18.4724°N / 120.3667°E (South China Sea, Philippines)
Antipode18.472°S / 59.633°W
Shaking intensityLight shaking
Felt5 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoAmbalatungan (150 km / 93 mi)
Nearby towns and cities22 km (14 mi) W of Davila (pop: 3,470) | Show on map | Quakes nearby
31 km (19 mi) WNW of Pasuquin (Ilocos Norte) (pop: 5,770) | Show on map | Quakes nearby
39 km (24 mi) NW of Laoag (pop: 102,100) | Show on map | Quakes nearby
41 km (26 mi) NW of San Nicolas de Ilocos (Ilocos Norte) (pop: 34,200) | Show on map | Quakes nearby
51 km (32 mi) NNW of Batac City (pop: 53,500) | Show on map | Quakes nearby
100 km (62 mi) N of Vigan (pop: 48,500) | Show on map | Quakes nearby
172 km (107 mi) WNW of Tuguegarao City (pop: 115,100) | Show on map | Quakes nearby
435 km (270 mi) N of Manila (pop: 1,600,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds 25.8°C (78 F), humidity: 81%, wind: 4 m/s (7 kts) from ENE
Estimated seismic energy released1.4 x 1012 joules (392 megawatt hours, equivalent to 338 tons of TNT) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
4.926 km22 Km W of Davila, PhilippinesUSGS
4.926 kmLuzon, PhilippinesRaspberryShake
4.919 kmLuzon, PhilippinesGFZ
4.910 kmLuzon, PhilippinesIRIS
4.94 kmPhilippines: 042 Km N 87° W of Burgos (Ilocos Norte)PHIVOLCS
5.010 kmLuzon, PhilippinesGeoAu


Seismic station: Taitung (TWGB/TW network) | Distance from quake: 489 km / 304 mi | Show on map | Station Info
Seismic station Taitung: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (6)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Davila, Ilocos Norte, Ilocos (24.8 km E of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 2-5 s : Moderate shaking of the ground (reported through our app)  
Laoag, Ilocos Norte, Ilocos (39.1 km SE of epicenter) [Map] / Light shaking (MMI IV) / both vertical and horizontal swinging / 20-30 s
Digos city (1413.2 km SSE of epicenter) [Map] / not felt
Laoag, Ilocos Norte, Ilocos (37.2 km SE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s : It did felt swinging and shaking. Liquids in a jar are swaying.  
Batac / Weak shaking (MMI III)
Makati city / Weak shaking (MMI III) / 2-5 s : Slight  

Earlier earthquakes in the same area

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